改性油页岩灰渣对水中镉离子的吸附性能
Cd2+adsorption in water by modified oil shale ash
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摘要: 采用酸碱化改性方法对油页岩灰渣进行改性，确定最佳酸碱化方案，并研究了环境因素对改性油页岩灰渣吸附镉离子的影响。实验研究结果表明，油页岩灰渣经50％的HNO3和20％的NaOH处理时，对镉离子的吸附能力最强。在吸附温度为30℃，初始溶液pH为6~7条件下，0.6 g 的改性油页岩灰渣对50 mg/L Cd2+溶液50 mL，吸附150 min时，其吸附率达到86%以上。在实验条件下，改性油页岩灰渣对Cd2+的吸附符合Langmuir和Freundlich等温吸附方程，相关系数分别为0.9626和0.9944，其对Cd2+的理论饱和吸附量达到7.91 mg/g。改性油页岩灰渣对Cd2+的吸附主要归因于离子交换和表面吸附作用。Abstract: Experiments were performed by using acid modification method to modify oil shale ash， in order to determine the optimum acid-base solution. Meanwhile， the impact of environment factors on oil shale ash Cd2+ adsorption was studied in this experiment. Result indicates that oil shale ash has the strongest capacity of adsorption at 50% HNO3 and 20% NaOH treatments. The elimination rate can reach to 86% by adding 0.6 g modified oil shale ash at 30℃， initial pH between 6 and 7， to 50 mL of 50 mg/L Cd2+ solution after 150 minutes (adsorption time). In this experiment， the results were correlated using Langmuir and the Freundlich isotherm formula； the correlation coefficients were 0.9626 and 0.9944， respectively. Moreover， the theory cadmium saturation adsorption capacity reached to 7.91 mg/g. In short， modified oil shale ash on Cd2+ adsorption is mainly based on the ion exchange and the effect of surface adsorption.
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Key words:
- modified oil shale ash /
- Cd2+ /
- adsorption
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